Welcome, Dylan!
Here's one recent thread detailing a complete overhaul of a Play Pac:
http://www.fiberglassrv.com/forums/f...ead-80903.html
There are others, which you can best find using the "Site Search/Google" option at the bottom of the search menu. It's also a way to find old threads on specific technical questions.
All else fails, ask away!
How about some pictures, inside and out, to start out?